# Solar eclipse of September 4, 2100

A total solar eclipse will occur at the Moon's descending node of orbit on Saturday, September 4, 2100, with a magnitude of 1.0402. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring about 2.5 days before perigee (on September 6, 2100, at 20:30 UTC), the Moon's apparent diameter will be larger. This will be the last solar eclipse of the 21st century.
The path of totality will be visible from parts of Sierra Leone, Guinea, Côte d'Ivoire, Ghana, Togo, Benin, Nigeria, Cameroon, the Central African Republic, the Democratic Republic of the Congo, Rwanda, southwestern Uganda, Burundi, Tanzania, Mozambique, and Madagascar. A partial solar eclipse will also be visible for parts of Africa, Southern Europe, the Middle East, and Antarctica.

## Eclipse details

Shown below are two tables displaying details about this particular solar eclipse. The first table outlines times at which the moon's penumbra or umbra attains the specific parameter, and the second table describes various other parameters pertaining to this eclipse.
September 4, 2100 Solar Eclipse Times :
| Event | Time (UTC) |
| First Penumbral External Contact | 2100 September 04 at 06:09:54.9 UTC |
| First Umbral External Contact | 2100 September 04 at 07:08:48.3 UTC |
| First Central Line | 2100 September 04 at 07:09:29.5 UTC |
| First Umbral Internal Contact | 2100 September 04 at 07:10:10.6 UTC |
| First Penumbral Internal Contact | 2100 September 04 at 08:16:19.6 UTC |
| Greatest Duration | 2100 September 04 at 08:47:54.7 UTC |
| Greatest Eclipse | 2100 September 04 at 08:49:20.3 UTC |
| Ecliptic Conjunction | 2100 September 04 at 08:52:53.1 UTC |
| Equatorial Conjunction | 2100 September 04 at 09:08:27.2 UTC |
| Last Penumbral Internal Contact | 2100 September 04 at 09:21:56.1 UTC |
| Last Umbral Internal Contact | 2100 September 04 at 10:28:15.4 UTC |
| Last Central Line | 2100 September 04 at 10:28:58.8 UTC |
| Last Umbral External Contact | 2100 September 04 at 10:29:42.2 UTC |
| Last Penumbral External Contact | 2100 September 04 at 11:28:33.3 UTC |
September 4, 2100 Solar Eclipse Parameters :
| Parameter | Value |
| Eclipse Magnitude | 1.04021 |
| Eclipse Obscuration | 1.08203 |
| Gamma | −0.33839 |
| Sun Right Ascension | 10h53m24.7s |
| Sun Declination | +07°04'34.9" |
| Sun Semi-Diameter | 15'51.3" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 10h52m46.7s |
| Moon Declination | +06°46'49.6" |
| Moon Semi-Diameter | 16'14.1" |
| Moon Equatorial Horizontal Parallax | 0°59'35.2" |
| ΔT | 124.3 s |

## Eclipse season

This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.
Eclipse season of August–September 2100 :
| August 19 Ascending node (full moon) | September 4 Descending node (new moon) |
| Penumbral lunar eclipse Lunar Saros 120 | Total solar eclipse Solar Saros 146 |

## Related eclipses
### Eclipses in 2100

* A penumbral lunar eclipse on February 24.
* An annular solar eclipse on March 10.
* A penumbral lunar eclipse on August 19.
* A total solar eclipse on September 4.

### Metonic

* Preceded by: Solar eclipse of November 15, 2096
* Followed by: Solar eclipse of June 22, 2104

### Tzolkinex

* Preceded by: Solar eclipse of July 23, 2093
* Followed by: Solar eclipse of October 16, 2107

### Half-Saros

* Preceded by: Lunar eclipse of August 29, 2091
* Followed by: Lunar eclipse of September 9, 2109

### Tritos

* Preceded by: Solar eclipse of October 4, 2089
* Followed by: Solar eclipse of August 4, 2111

### Solar Saros 146

* Preceded by: Solar eclipse of August 24, 2082
* Followed by: Solar eclipse of September 15, 2118

### Inex

* Preceded by: Solar eclipse of September 23, 2071
* Followed by: Solar eclipse of August 15, 2129

### Triad

* Preceded by: Solar eclipse of November 3, 2013
* Followed by: Solar eclipse of July 6, 2187

### Solar eclipses of 2098–2101

This eclipse is a member of a semester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.
The partial solar eclipse on October 24, 2098 occurs in the previous lunar year eclipse set.
Solar eclipse series sets from 2098 to 2101 :
| Ascending node | Ascending node | Ascending node | Descending node | Descending node | Descending node |
| Saros | Map | Gamma | Saros | Map | Gamma |
| 121 | April 1, 2098 Partial | −1.1005 | 126 | September 25, 2098 Partial | 1.14 |
| 131 | March 21, 2099 Annular | −0.4016 | 136 | September 14, 2099 Total | 0.3942 |
| 141 | March 10, 2100 Annular | 0.3077 | 146 | September 4, 2100 Total | −0.3384 |
| 151 | February 28, 2101 Annular | 0.9964 | 156 | August 24, 2101 Partial | −1.1392 |

### Saros 146

This eclipse is a part of Saros series 146, repeating every 18 years, 11 days, and containing 76 events. The series started with a partial solar eclipse on September 19, 1541. It contains total eclipses from May 29, 1938 through October 7, 2154; hybrid eclipses from October 17, 2172 through November 20, 2226; and annular eclipses from November 30, 2244 through August 10, 2659. The series ends at member 76 as a partial eclipse on December 29, 2893. Its eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.
The longest duration of totality was produced by member 26 at 5 minutes, 21 seconds on June 30, 1992, and the longest duration of annularity will be produced by member 63 at 3 minutes, 30 seconds on August 10, 2659. All eclipses in this series occur at the Moon’s descending node of orbit.
Series members 16–37 occur between 1801 and 2200: :
| 16 | 17 | 18 |
| March 13, 1812 | March 24, 1830 | April 3, 1848 |
| 19 | 20 | 21 |
| April 15, 1866 | April 25, 1884 | May 7, 1902 |
| 22 | 23 | 24 |
| May 18, 1920 | May 29, 1938 | June 8, 1956 |
| 25 | 26 | 27 |
| June 20, 1974 | June 30, 1992 | July 11, 2010 |
| 28 | 29 | 30 |
| July 22, 2028 | August 2, 2046 | August 12, 2064 |
| 31 | 32 | 33 |
| August 24, 2082 | September 4, 2100 | September 15, 2118 |
| 34 | 35 | 36 |
| September 26, 2136 | October 7, 2154 | October 17, 2172 |
| 37 |
| October 29, 2190 |

### Metonic series

The metonic series repeats eclipses every 19 years (6939.69 days), lasting about 5 cycles. Eclipses occur in nearly the same calendar date. In addition, the octon subseries repeats 1/5 of that or every 3.8 years (1387.94 days). All eclipses in this table occur at the Moon's descending node.
22 eclipse events between June 23, 2047 and November 16, 2134 :
| June 22–23 | April 10–11 | January 27–29 | November 15–16 | September 3–5 |
| 118 | 120 | 122 | 124 | 126 |
| June 23, 2047 | April 11, 2051 | January 27, 2055 | November 16, 2058 | September 3, 2062 |
| 128 | 130 | 132 | 134 | 136 |
| June 22, 2066 | April 11, 2070 | January 27, 2074 | November 15, 2077 | September 3, 2081 |
| 138 | 140 | 142 | 144 | 146 |
| June 22, 2085 | April 10, 2089 | January 27, 2093 | November 15, 2096 | September 4, 2100 |
| 148 | 150 | 152 | 154 | 156 |
| June 22, 2104 | April 11, 2108 | January 29, 2112 | November 16, 2115 | September 5, 2119 |
| 158 | 160 | 162 | 164 |
| June 23, 2123 | | | November 16, 2134 |

### Tritos series

This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.
Series members between 1801 and 2200 :
| December 21, 1805 (Saros 119) | November 19, 1816 (Saros 120) | October 20, 1827 (Saros 121) | September 18, 1838 (Saros 122) | August 18, 1849 (Saros 123) |
| July 18, 1860 (Saros 124) | June 18, 1871 (Saros 125) | May 17, 1882 (Saros 126) | April 16, 1893 (Saros 127) | March 17, 1904 (Saros 128) |
| February 14, 1915 (Saros 129) | January 14, 1926 (Saros 130) | December 13, 1936 (Saros 131) | November 12, 1947 (Saros 132) | October 12, 1958 (Saros 133) |
| September 11, 1969 (Saros 134) | August 10, 1980 (Saros 135) | July 11, 1991 (Saros 136) | June 10, 2002 (Saros 137) | May 10, 2013 (Saros 138) |
| April 8, 2024 (Saros 139) | March 9, 2035 (Saros 140) | February 5, 2046 (Saros 141) | January 5, 2057 (Saros 142) | December 6, 2067 (Saros 143) |
| November 4, 2078 (Saros 144) | October 4, 2089 (Saros 145) | September 4, 2100 (Saros 146) | August 4, 2111 (Saros 147) | July 4, 2122 (Saros 148) |
| June 3, 2133 (Saros 149) | May 3, 2144 (Saros 150) | April 2, 2155 (Saros 151) | March 2, 2166 (Saros 152) | January 29, 2177 (Saros 153) |
| December 29, 2187 (Saros 154) | November 28, 2198 (Saros 155) |

### Inex series

This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.
Series members between 1801 and 2200 :
| March 24, 1811 (Saros 136) | March 4, 1840 (Saros 137) | February 11, 1869 (Saros 138) |
| January 22, 1898 (Saros 139) | January 3, 1927 (Saros 140) | December 14, 1955 (Saros 141) |
| November 22, 1984 (Saros 142) | November 3, 2013 (Saros 143) | October 14, 2042 (Saros 144) |
| September 23, 2071 (Saros 145) | September 4, 2100 (Saros 146) | August 15, 2129 (Saros 147) |
| July 25, 2158 (Saros 148) | July 6, 2187 (Saros 149) | |